schmidt



(No Model.) 2Sheets-Sheet 2.

G. J. SCHMIDT. i Machine for Working Natural-Stone. No. 239,854. Y Patented Apri|5,1s8|.

NPEIERS, PHOTILLITMOGRAPHER. WASMINGON, l) C.

UNITED vSTATES.

PATENT OFFICE. y

MACHINE FOR WORKING NATURAL STONE.

SPECIFICATION forming part of Letters Patent No. 239,854, dated April 5, 1881. Application filed September 6, 1880. (No model.) Patented in Germany August 13,1878.

To all whom it may concern:

Be it known that I, Go'rfrLIE'B JonANNEs SCHMIDT, of Ober Peilau, Gnadenfrei, Prussia, German Empire, have invented a Machine for Working Natural Stones, (for which I have received German Patent No. 5,043, for iifteen years, dated August 13, 1878,) of which the following is a specification.

Figure 1 is a front elevation, partly in section, of my improved machine for cutting stone. Fig. 2is a plan or top view of the same 5 and Fig. 3, an end view, partly in section, `of the same.

The object of this invention is to produce a machine for cut-ting large rocks or blocks of stone into shape for building purposes without requiring manual labor to do such Work. The machine which I have invented is particularly adapted to cutting stone into slabs for sidewalks, iioors, steps, sills, mantels, and into the forms required in the building of walls, arches, gutter-curbs, and the like. At present these stones are cut ont of the rough by hand, and much material is Wasted in chopping off the pieces necessary to produce the slabs or blocks of the desired form; but by means of my improved maehine the block of stone can be subdivided into useful pieces withoutinvolving practically any waste.

My invention consists in the new combination of parts hereinafter more fully described.

A, Fig. 3, represents the block of stone to be cut and subdivided. It is placed upon a suitable platform or truck, B, and beneath a series of chisels, C C, which act vertically by reciprocating motion imparted to them by steampower, andwhich, in addition to their vertical reciprocating motion, also have a slow horizon tal movement imparted to them, so that the several chisels, all of which are placed in a row, as indicated in Fig. l, will at any one time produce a straight cut and two cut surfaces.

, be divided in suitable man ner-for example, as

indicated by dotted lines in Fig. S--the block being, of course, turned whenever the direc- By this arrangement the block A can water also carries on the dust and mud by the act of cutting. This mud, if preserved, can be used in the manufacture of earthenware goods.

The machine shown in the drawings contains the chisels O C, all set into a straight line; but it is evident that by arranging these chisels in an arc of a circle or otherwise, cylindrical or other shaped cuts may be produced by the machine.

The chisels O C are made of best quadrangular cast-steel, and in order to increase their stability they are arranged `in pairs, side by side, as shown in Fig. l, each pair being secured to the piston-rod D of a small steamcylinder, E, there being as many steamcylin ders in the line as there are pairs of chisels O C. At a short distance above the cutting ends each pair of chisels is tied together by a,

steel band, b. The bevels'of the cutting ends of each pair of chisels are set at an angle to each other, so as thereby to increase the eect of the reciprocating motion of the chisels upon the stone. Each pair of chisels, as has already been indicated, is operated by its own steamcylinder, being attached to a separate piston, and therefore each pair of chisels has its own play vertically, so that inequalities in the hard-v ness of the respective chisels, or of parts of the stone operated upon, will not cause the action of one pair of chisels to interfere with the action of any of the other pairs.`

The several steam-cylinders E are all of equal size, and are placed at equal distances apart, and are united together into one continuous frame, F, the ends of which have rackbars d d, as shown in Fig. l. Into these racks engage pinions e, that-are revolved vslowly by suitable machinery, and by means of which the entire gang of steam-cylinders and chisels receives a horizontal movement, step by step, sufficient to move one pair of chisels as far as the distance between it and the next pair, so

that the continuity of a cutis insured. The

frame F, into which the cylinders E are built, rests upon rollers f, which render the abovementioned horizontal movement practicable.

Two separate steam-cylinders, S, placed below the shafts G H, that areshown in Fig. 2, impart rotary motion to these shafts, Which said shafts are united by a rod, I, so that the ICO movement of one will be precisely equal to that o1" the other 5 and these said shafts G H, by suitable eccentrics g, reciprocate the two rods h h, whose lower enlarged ends move in proper guides i z'.

Through the lower ends of the two rods hh is passed a horizontal bar, J, to which the rods k 7c, that control the positions of the slidevalves T of the cylinders E, are attached. By means of the shafts G H the bar J is reciprocated up and down, thereby moving the slidevalves of the several cylinders E simultaneously, and yet, as the bar J passes through slots of its moving rods, it is capable of horizontal displacement in conjunction with that of the cylinders E, already described, without thereby in the least interfering with its vertical movement.

The frame of that part ot' the machine which carries the steam-cylinders is supported upon four or more screw-spindles, L L, which carry beveled gear-wheels l, into which engage suitable pinions m, that are driven by suitable belts or other contrivances for the-purpose of adjusting the position of the cylinders E vertically and allowing a gradual downward feed of the chisels, as well as a proper placing of the machinery with reference to higher or lower to this specication in the presence of two subseribin g witnesses.

' GOTTLIEB JUIIANNES SCHMIDT. Witnesses:

PAUL W. ENrscHER,

FRANK C. ZIMMERMAN. 

